| /* |
| * mdmon - monitor external metadata arrays |
| * |
| * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de> |
| * Copyright (C) 2007-2009 Intel Corporation |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| extern const char Name[]; |
| |
| enum array_state { clear, inactive, suspended, readonly, read_auto, |
| clean, active, write_pending, active_idle, broken, bad_word}; |
| |
| enum sync_action { idle, reshape, resync, recover, check, repair, bad_action }; |
| |
| struct active_array { |
| struct mdinfo info; |
| struct supertype *container; |
| struct active_array *next, *replaces; |
| int to_remove; |
| |
| int action_fd; |
| int resync_start_fd; |
| int metadata_fd; /* for monitoring rw/ro status */ |
| int sync_completed_fd; /* for checkpoint notification events */ |
| int safe_mode_delay_fd; |
| unsigned long long last_checkpoint; /* sync_completed fires for many |
| * reasons this field makes sure the |
| * kernel has made progress before |
| * moving the checkpoint. It is |
| * cleared by the metadata handler |
| * when it determines recovery is |
| * terminated. |
| */ |
| |
| enum array_state prev_state, curr_state, next_state; |
| enum sync_action prev_action, curr_action, next_action; |
| |
| int check_degraded; /* flag set by mon, read by manage */ |
| int check_reshape; /* flag set by mon, read by manage */ |
| }; |
| |
| /* |
| * Metadata updates are handled by the monitor thread, |
| * as it has exclusive access to the metadata. |
| * When the manager want to updates metadata, either |
| * for it's own reason (e.g. committing a spare) or |
| * on behalf of mdadm, it creates a metadata_update |
| * structure and queues it to the monitor. |
| * Updates are created and processed by code under the |
| * superswitch. All common code sees them as opaque |
| * blobs. |
| */ |
| extern struct metadata_update *update_queue, *update_queue_handled; |
| |
| #define MD_MAJOR 9 |
| |
| extern struct active_array *container; |
| extern struct active_array *discard_this; |
| extern struct active_array *pending_discard; |
| extern struct md_generic_cmd *active_cmd; |
| |
| void remove_pidfile(char *devname); |
| void do_monitor(struct supertype *container); |
| void do_manager(struct supertype *container); |
| extern int sigterm; |
| |
| int read_dev_state(int fd); |
| int is_container_member(struct mdstat_ent *mdstat, char *container); |
| |
| struct mdstat_ent *mdstat_read(int hold, int start); |
| |
| extern int exit_now, manager_ready; |
| extern int mon_tid, mgr_tid; |
| extern int monitor_loop_cnt; |
| |
| /* helper routine to determine resync completion since MaxSector is a |
| * moving target |
| */ |
| static inline int is_resync_complete(struct mdinfo *array) |
| { |
| unsigned long long sync_size = 0; |
| int ncopies, l; |
| switch(array->array.level) { |
| case 1: |
| case 4: |
| case 5: |
| case 6: |
| sync_size = array->component_size; |
| break; |
| case 10: |
| l = array->array.layout; |
| ncopies = (l & 0xff) * ((l >> 8) & 0xff); |
| sync_size = array->component_size * array->array.raid_disks; |
| sync_size /= ncopies; |
| break; |
| } |
| return array->resync_start >= sync_size; |
| } |